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Oveview
The type is leading-edge deterministic wallets that are described in BIP 0032.Just have to copy root-seed,You can restore overall HD wallet,backup of millions keys or HD wallet , and export.
It can generate public key without users have exposure to private key.In other words,possible to generate in independent environments,private key will be able to storage in safe place.

Why destory relationship?
Method of generating branch of pubkey from extended pubkey has potential risk.
Because extended pubkey is included in chain code,if single child privkey leak out become all child privkey leak out.

BIP0043/BIP0044
BIP0043 proposed the first level of BIP32 tree structure to be used as "purpose".
By extending this BIP, BIP 0044 defines the number "44 '" representing t "purpose" based on BIP 0043.
The ｆirst layer is " m / 44 ' / " and "44” show number of purpose.
It means that wallet adapt construction of BIP0044.
BIP0044 aim to improve Wallet's compatibility by unifying rules.